604 in a A7 enclosure anyone?

[selmerdave]

I guess you're responding to me? The obvious trade-offs would be beaming with frequency range that the LF driver must produce (with a 15" cone) and the difficulties of crossing over from a direct radiator to a horn in a sensitive area at 1.5k. In return one gets truly full-range point-source playback.

Dave

[selmerdave]

Originally posted by bowtie427ss:
</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif"> Wow, this has me confused. What is so bad about the LF driver of the 604? And what are the better bass drivers that are available? I don't remember seeing that there.

<font size="2" face="Verdana, Helvetica, sans-serif">My understanding is pretty basic here, but i think the issue is not so much the LF ability of the 604, as it is the high XO dictated by the size/cutoff of the HF horn.

I've just gone thru this first hand trying to model a box for a duplex very similar to the 604. The driver i'm using is capable of flat 30 hz response in the proper size and tuned box. Unfortunately, if i try to put this driver in that box, then it's response becomes like OG's roller coaster. The driver uses the Urei style HF horn and the ideal XO is 1.6k. What i have learned about duplex's thus far is that the limitations mostly seem to revolve around the XO point, which in my understanding cannot be shifted much.</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I would agree just as every speaker configuration has its disadvantages, this is the most easily siteable of the 604. Its the same whether the cabinet is a rear horn or an A7 or a bass reflex. There are plenty of people of course who have found it to be an acceptable trade-off and who have learned to live with 604's.

Dave

[boltupright]

I tried it with my 604-8G's I made a custom back board so that the HF diaphragm covers would have the room.
They sounded like **** to my ears, I used the 604-8G crossovers, maybe that was a mistake.
I put the 416-8B & the 511's with the the 802-8G's & all was back to normal.

[MERDY]

a while back i asked a similar question with no responses so i tried it myself just to satisfy my curiousity as to why altec had never done this with all the varities of cabs and drivers.
i have 3 pairs of 604, 2 e and 1 k(nib),while i also have a7 cabs,816 cabs and split 210 horns, i started in the 816 and right away felt that there was big phase problem and annoying reflections , i then used active crossover to try keeping the phase together and balance both the drivers outputs , the bass horn does help raise it a few db but the problems of i have no idea why it sounds **** persisted
after this i realized altec would have at least marketed this to sell more units
while playing with my big horns over the last year besides time alining i have realised that for clear sound the mouths of the bass horn(exit)has to also to be on the same line to integrate with the 500hz c point,on the hf horns(i use 203b)
i have seen in pics and ebay some newer boxes where the hf horn is extended to the mouth of the bass horn , i know tannoy uses front horns but those drivers are not as deep and the cone acts as a wave guide, i should have tried it on the jbl 2150 before i sold them
just put them in a nice 9cft box or a 6cft box with a 6cft sub box below and kill yourself softly with sweet tunes
http://www.audiocircle.com/gallery/d...bum=1108&pos=1

[MERDY]

forgot to mention my 816 cabs have a varity of back extenders ,i have added 12in all around so as to get a bigger box ,have also made gualitine port adjustments or sealed and also want to try a subwoofer driver in any ideas any one???, its the best 20 bucks spent on a altec box(bad shape )

[bigjunglejim]

Hi there
"Stanley Screamers had 2 604 HPLN in what seems to be an 817 cabinet". Stan Miller (Stanal Sound) also put 604 HPLN's in Altec 816's. He cut a hole in the back of the 816's to allow room for the tweeter magnet. He then put a plate over the outside. That extra 3/4" was all the extra space needed. I have two of these, you want to buy them? LOL. I have 8 Stanley Scramer 817's loaded with 421's and 421 LF's. Stan re-tuned these for more punch at 60 Hz. Below 60 Hz they fall off quickley. The standard Altec 817's went much lower without the boost at 60Hz. Stan used Subs as part of a 4 way system along with the retuned 817's. The 604 HPLN (Hi Power Less Network) was for sound reinforcement and stage monitors. They were not designed for studio or home HiFi, they were designed for higher sound pressure levels. Later Altec made the 904-8A which was basicly a 604 HPLN. Stan worked with the engineers at Altec to make a more roadable 210,211 box for touring systems. The end result was the 817. The 816 was the more space efficiant A-7/228 cabinet. By the way, Stan had an 18,000 sq ft cabinet shop in Nebraska that built speaker boxes. He later sold that shop to JBL. *special note, Stan was designing and testing trapazoid speaker boxes for JBL in the 80's after he had a falling out with Altec.

[quaramon]

I also tried my 604-8G's in my A7 boxes with a custom back board some ears ago, and yes, they didn't sound good.
The main reason is that the A7-horn gives an acoustical gain for the range between ~100-1500Hz, but not for the hf horn on the 604.
So the treble level gets way to low with original crossovers, even without any dampening at all to the hf-horn.
Seems like the high frequency horn in 604 has lower sensitivity than an 800/900 driver horn.